Idea is simple: add random loot to alien bones, which surely should not always be empty, especially since there is an "alien blaster" in the game already.
Being able to pick up the alien bones is another idea. A good one, but not this idea. Do we even have an alien bones inventory item in this game, other than the ground effect item? I don't think so - someone would need to add that, i bet, unless you use "Anna's Bones" bag of bones item and rename it. Good idea but clearly beyond this post's intention.